code: def test_protocol(self):
      answer = ExtractedAnswer(
          data="42",
          query="What is the answer?",
          document=Document(
              content="I thought a lot about this. The answer is 42."
          ),
          context="The answer is 42.",
          score=1.0,
          document_offset=ExtractedAnswer.Span(42, 44),
          context_offset=ExtractedAnswer.Span(14, 16),
          meta={"meta_key": "meta_value"},
      )
      assert isinstance(answer, Answer)
  
file_path: haystack/test/dataclasses/test_answer.py
imports: from pandas import DataFrame
  from haystack.dataclasses.answer import Answer, ExtractedAnswer, ExtractedTableAnswer, GeneratedAnswer
  from haystack.dataclasses.document import Document
label_desc: Use image node_id 2 for calling the TestExtractedAnswer obj's underlying member method code with example usage: obj.test_protocol() without return types